Lock for rocking-chairs



(No ModeL) J. H. MQLEAN. LOOK FOR ROCKING CHAIRS, CRIBS, 8w. No. 278,162. Patented May 22,1883.

UNITED, STATES PATENT OFFICE.

JA ES H. MoLEAN, on LAWRFNGEBURG, INDIANA.

LOOK FOR ROCKING-CHAIRS, CRIBS, 800.

SPECIFICATION forming part of Letters Patent No. 278,162, dated May 22, 1883.

Application filed January 13, 1883. (No model.) i

signed more especially for application to the cribs and rocking-chairs seen in the patent granted to me May 23, 1876, the object of said device being to lock the crib or chair, so as to prevent it accidentally oscillating on the supporting base, stand, or pedestal. The lock consists, essentially, of a pivoted latch, catch,

or book, having near its fulcruma box, within which latter a cam or eccentric is adapted to revolve, said cam being mounted on a shaft that passes through the frame of the crib or other rocking member, and is provided with an external handle wherewith the eccentric is operated. When this eccentric is turned in one direction the latch or hook is allowed to descend and engage with a pin or other stop projecting from the stand or pedestal or other fixed member, while an opposite rotation of the cam elevates the free or hooked end of the catch and disengagesit from said pin, as hereinafter more fully described.

My invention further consists in so slotting the eccentric and notching the shaft as to render it possible for a single screw or bolt to fasten the lock to the chair, and also serve as the pivot for the latch, as hereinafter more fully described.

In the annexed drawings, Figure '1 is an elevation showing my lock applied to the frame of a crib or chair or otherroeking member and engaged with the stop-pin. Fig. 2 is .a similar elevation, but showing the catch disengaged from said pin. Fig.3 is a plan showing the lock in the same position asin Fig. 1. Fig. 4 is an enlarged horizontal section of the lock, taken at the line 2 z of Fig. 2, the eccentric or cam being shown in elevation. Fig. 5 is an elevation of the fulcrum end of the latch or hook. Fig. 6 is an enlarged transverse section'of the notched shaft, the slotted portion of the eccentric being shown in elevation.

Fig. 7 represents a modification of the catch or book of the look. I

A represents part of the frame of a crib or chair or other rocking or swinging member, and B is a portion of the supporting base, standard, or other fixed member, to which said frame is to be locked whenever desired. Frame A has applied to its inner side a latch or catch, 0, having at its free end a hook, D, adapted to engage with a screw or pin or other suitable stop, E, projecting from the standard B,a-s seen in Fig. 3. Hook Dis provided with two inclines, cl (1, that facilitate engagement of the latch with the stop-pin, the opposite or i'ulcrnmed end of said latch being composed of a perforated lug, F, through which passes the pivot screw or bolt Gr. Connecting this lug F with the latch O is a box, H, slotted at h to permit the catch swinging without coming in contact with the shaft 1,

said slot being concentric with the pivot G. Shaft I has cast with it an external crank or handle, J, having a knob, j, the inner end of said shai't being notchcd at i, over which notch fits the. slot lot a cam or eccentric, L, that is adapted to revolve within the box 11. This eccentric is soshaped and applied to the shaft 1 as to depress the latch (J 1) when handle J is raised, and to elevate said latch as soon as the handle is brought to a horizontal position.

N is a washer interposed between handle J and the frame A.

When it is desired to lock the crib or chair or other rocking or swinging member A, so as to prevent it oscillating in either direction,

the handle J is brought to the erect position revolve within the box 11 in such a manner as to depress'the catch 0 and engage its hook D with the pin or other stops, E, as seen in Fig. 1. If the cradle or chair should be rocking at the moment the latch is thus thrown down, eitherof the inclines d or d will ride up on the pin E, and thereby guide the hooltonto said pin without causing any sudden jar or concussion, which would result in case said hook terminated with abrupt shoulders. To unlock the swinging memberA it is only necessary to turn the handle J down to the horizontal position indicated by dotted lines in culiar position of the cam L, which retention is still further guarded against by the weight or knob j at the end of handle J. In fitting the lock together the shaft I is first passed through the appropriate hole in frame A, and notch i is disposed vertically, as seen in Fig. 6. Cam L is then placed in the box H, so as to bring the slot Z in line with said notch, after which act the box is shoved down so as to cause said slot to engage with the notch. Pivot Gr being then inserted the various members of the lock are at once securely coupled together without using rivets or other permanentretaining devices.

Ji'desircd, the end of the latch may have a series of hooks, as seen at D in Fig. 7.

I claim as my invention- 1. The combination of swinging latch 0, box II,operating-shatt I, andeccentric L, said eccentric being located within box II, which latter is situated near the fulcrum F of the latch (3, whose free end has one or more hooks, D, for engaging with a stop-pin, substantially as herein described.

2. The combination of a swinging latch, 0, having at its free end one or more hooks, D, flanked by inclined planes d d, said latch being provided near its fulcrum F with a box, H, within which latter is located an eccentric, L, operated by the shaft I, substantially as described.

3. The combination, in a chair-lock, ot' latch G D, slotted box 11 h, notched shaft I i, and slotted eccentric Ll, substantially as described.

4. The combination, in a locking device, of swinging latch G D F G, stop-pin E, slotted box II h, notched shaft I t', operating-handle J, and slotted eccentric L I, said latch, box, and shat't'being applied to the rocking memher A, while the stop-pin E projects from the stand or base B, substantially as herein described.

In testimony whcreot'I attix my signature in presence of two witnesses.

JAMES II. M'GLEAN.

Vitnesses JAMES H. LAYMAN, SAML. S. CARPENTER. 

